Journal
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
Volume 11, Issue 6, Pages 5217-5225Publisher
ESG
DOI: 10.20964/2016.06.16
Keywords
Li3V2(PO4)(3)/carbon composites; MWCNTs modification; rheological phase reaction; cathode materials; lithium ion batteries; electrochemical performances
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Funding
- NNSF of China [21403057]
- Ph.D. Programs Foundation of Henan University of Technology [BS150535]
- Plan for Scientific Innovation Talent of Henan University of Technology, China [2012CXRC09]
- Fundamental Research Funds for the Henan Provincial Colleges and Universities, China [2014YWQN03, 2015RCJH10]
- Innovation Scientists and Technicians Troop Construction Projects of Zhengzhou City, China [131PLJRC652]
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The multi-walled carbon nanotubes (MWCNTs) modified Li3V2(PO4)(3)/carbon composites (MWCNTs-LVPCs) are synthesized through the rheological phase reaction method using MWCNTs as a highly conductive agent. MWCNTs-LVPCs are characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscope. Charge-discharge cycling performance is also used to characterize the electrochemical properties. X-ray diffraction result reveals that the added MWCNTs do not have a significant effect on the crystal structure of MWCNTs-LVPCs, however, crystal particles growth of MWCNTs-LVPCs are dramatically inhibited by MWCNTs in scanning electron microscopy test. The electrochemical measurements show that the 1.0 wt.%-MWCNTs-LVPC composite yields the highest discharge specific capacity of 182.38 and 163.93 mAh g(-1) at current rate of 15 and 90 mA g(-1) among all the MWCNTs-LVPCs, which are much higher than those of Li3V2(PO4)(3)/carbon composite. After 100 cycles, the 1.0 wt.%-MWCNTs-LVPC composite still maintains a stable capacity of 125.37 mAh g(-1). Therefore, construction of MWCNTs modified Li3V2(PO4)(3)/carbon composites offers an effective and convenient technique to improve the conductivity and electrochemical performances of Li3V2(PO4)(3)/carbon composites.
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